The instruments necessary for the proper performance of this operation are very simple and very few.A special receptacle for the paraffin, as described by Smith, while convenient, is not essential.The syringe is the all-important consideration; an allmetal syringe is to be preferred because of the ease with which it may be absolutely sterilized by boiling. One with the screw worm on the piston rod, and on this the thumb screw that can be attached to the barrel of the syringe, is almost invaluable. The size of the syringe is not so very important; that it be not ungainly in the handling is about the only practical limitation. Smith and many others use one with a capacity of about 90 minims, while Downie employs one that will hold 10 c.c. (2.5 3).The needle should be short and but a little larger in diameter and lumen than is the ordinary hypodermic needle.